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engines/illusions/time.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "illusions/time.h"
+#include "common/system.h"
+
+namespace Illusions {
+
+uint32 getCurrentTime() {
+	return g_system->getMillis() / 16;
+}
+
+bool isTimerExpired(uint32 startTime, uint32 endTime) {
+	uint32 currTime = getCurrentTime();
+	return !(
+		(startTime > endTime && (currTime <= endTime || currTime >= startTime)) ||
+		(startTime < endTime && currTime <= endTime && currTime >= startTime));
+}
+
+uint32 getDurationElapsed(uint32 startTime, uint32 endTime) {
+	uint32 currTime = getCurrentTime();
+	uint32 elapsed = endTime - startTime;
+	if (isTimerExpired(startTime, endTime))
+		return elapsed;
+	else if (startTime < endTime || currTime > startTime)
+		return currTime - startTime;
+	else
+		return currTime + elapsed - endTime;
+}
+
+} // End of namespace Illusions